Method for controlling magnetizing current in multipulse resista

Details Method for controlling magnetizing current in multipulse resista Method for controlling magnetizing current in multipulse resista

1978-10-30

1981-08-04

Shaw, C. C.

Electric heating

Metal heating

For bonding with pressure

323345, B23K 1124

Patent

active

042824176

ABSTRACT:
A method to control the welding transformer residual magnetizing current which normally continues circulating in the secondary circuit at the end of each welding pulse until the tips are opened. By utilizing a firing delay of the last half cycle in each welding pulse that brings the algebraic sum of the volt-seconds applied to the transformer to zero at the end of each welding pulse, the residual secondary current is nulled. This alleviates magnetizing current problems which occur in multiple pulse welding.

REFERENCES:
patent: 2440247 (1948-04-01), Dawson
patent: 2802146 (1957-08-01), Van Ness
patent: 3079547 (1963-02-01), Porter
patent: 3167704 (1965-01-01), Maag
patent: 3171079 (1965-02-01), Mierendorf et al.
patent: 3444455 (1969-05-01), Johnson et al.
patent: 3445620 (1969-05-01), Littwin et al.
patent: 3714545 (1973-01-01), Chiffert
patent: 4104724 (1978-08-01), Dix et al.

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